SCLERODERMA VULGARE AND ITS IOWA ALLIES 413 



2. SCLERODERMA CAEPA Pers. 



Subglobose or depressed, 3 — 8 cm. diam. ; peridium smooth or 

 only slightly roughened, never truly tuberculate, thick and firm ; 

 gleba at first white, finally ferruginous; trama lines light yel- 

 lowish; spores dark, globose, tuberculate, 7 — 12m in diameter. 



Johnson county (Shimek), Hesper, Winneshiek county 

 (Shimek). 



Very similar to 8. aurantium but with a slightly thinner peri- 

 derm which is essentially smooth or only slightly roughened. 



3. S. BOVISTA Fries. 



Sporophore subglobose, 3 — 5 cm. diameter, yellowish in color; 

 periderm rather thin and firm, flexible, smooth or somewhat 

 scaly ; gleba at first white, at last brownish ; lines of trama ochra- 

 ceous; spores globose, verrucose, 7 — 12 m diameter. 



Johnson county (Macbride, Shimek), Muscatine county 

 (Shimek). 



A very distinct form which appears to be fairly common. It 

 is easily distinguished by its firm, flexible periderm. 



4. S. VERRUCOSUM (Bull.) Pers. (S. tenerum Berk.) 



Sporophore subglobose, 2.5 — 7 cm. diameter, ochraceous, pur- 

 plish, or dingy brown; periderm thin and fragile above, firmer 

 beneath, covered with more or less angular warts, continued be- 

 low into a more or less stemlike base ; gleba white, then very aark 

 vinous or almost black, at last umber ; lines of trama white ; spores 

 globose, dark, warted, 7 — 12 p- in diameter. 



Unionville, Appanoose county (Shimek), Hesper, Winneshiek 

 county (Shimek), Mason City, Cerro Gordo county (Shimek). 



A widespread and rather common species which might easily 

 be passed over as immature specimens as it ranges quite small in 

 our territory. The thin, fragile periderm distinguishes it readily 

 from S. aurantium. The white trama lines also are quite dis- 

 tinctive. Probably second only to S. aurantium in common- 

 ness. 



II. SCLERANGICM Leville. 



Similar to Scleroderma except that the periderm ruptures 

 stellately, sometimes exposing a thin inner periderm. 



